Dental measuring-tool.



No. 825,896. PATENTBD JULY 17, 1906.

P. X. DUSSEAU 6: B. P. KIRK.

DENTAL MEASURING TOOL.

APPLICATION FILED DEC. 7. 1905.

'lI JTWESSES [WVE/VTORS ms NORRIS PETERS co.. wasumamu. v. c.

UNITED sTA-Tns IfaTIFENT omuon FRANCIS X. DUSSEAU AND BERNARD F. KIRK,OF DETROIT, MICHIGAN.

DENTAL MEASURING-TOOL.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed December 'h 1905. Serial No. 290,694.

Measuring-Tools; and we declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it pertains to make and use the same, referencebeing had to the accompanying drawings, which form a part of thisspecification.

This invention relates to dental measuring-tools, the object of theinvention being to provide an accurate measure to determine the distancearound a solid body-as, for example, around a tooth.

In the drawings, Figure 1 is a perspective of the complete tool. Fi 2 isa lon itudinal section. Fig. 3 is an eIevation of t e end of the toolshown on a larger scale.

The tool consists of a bar 2, preferably round and provided with alongitudinal groove 3, that extends from end to end of the bar, forminga deep track or guide for a slide that travels therein. Preferably theslide has a band-like body 5, that engages around the bar, and the endof which, 6, engages in the groove 3. The end of a flexible strap 7 issecured to the slide 5, and another end of the same strap 7 is securedto the end of the bar 3. To make the fastening, there is out a groove 8,inclined to the axis of the rod, and in this groove the end of the strap7 engages. Preferably the strap is made of a flexible metal, and the endof it is secured to the rod in the groove 3 by a drop of solder or anysuitable fastening. The end of the strap which engages with the slide 6is sharply bent and passed through an opening 9, so that the part infront of the opening 9 is at the one side of the depending win 6 andanother part of the strap 7 is at anot 1er side of the wing 6. Thismethod of construction causes the flexible strap to engage withconsiderable frictional resistance against the sides of the groove 3,requiring some force to move the slide along the bar. At the end of thebar farthest removed from the projecting or loop part of the strap is aprojection 10, the main use of which is to serve as an abutment orhandle to be used as a rest for the finger or a grip for the finger inmanipulating the tool. A similar projection 4 extends from the slide 5.

The bar is graduated along its length with any appropriate system ofgraduation.

In operation the movement of the slide 5 along the bar varies the sizeof the loop in the strap 7, and the graduation on the bar determines thereading which is to be given to the projecting loop.

What we claim is In combination with a grooved oar, a slide memberengaging thereabout and with one end portion reaching thereinto and itsother end portion projecting outwardly from said bar, said slide beingadapted to frictionally resist its travel therealong, a flexible straphaving one portion fixed to an end of said bar and the other portionfixed to said slide member, the intermediate portion of said strapextending beyond the end of said bar and being adapted to encircle anobject, substantially as described.

In testimony whereof we sign this specification in the presence of twowitnesses.

Witnesses:

MAY E. Kori, C. 0. JENNINGS.

